make it easier for the user to use a map in an expected location, show some information about found saves

gmap.py

@@ -6,12 +6,13 @@ import os.path
 from optparse import OptionParser
 import re
 import multiprocessing
+import time
 
 import world
 import quadtree
 
 helptext = """
-%prog [-p PROCS] [-d] <Path to World> <tiles dest dir>
+%prog [-p PROCS] [-d] <World # / Path to World> <tiles dest dir>
 """
 
 def main():
@@ -27,18 +28,28 @@ def main():
     options, args = parser.parse_args()
 
     if len(args) < 1:
-        print "You need to give me your world directory"
+        print "You need to give me your world number or directory"
         parser.print_help()
+        list_worlds()
         sys.exit(1)
     worlddir = args[0]
 
+    if not os.path.exists(worlddir):
+        try:
+            worldnum = int(worlddir)
+            worlddir = world.get_worlds()[worldnum]['path']
+        except (ValueError, KeyError):
+            print "Invalid world number or directory"
+            parser.print_help()
+            sys.exit(1)
+
+
     if len(args) != 2:
         parser.error("Where do you want to save the tiles?")
     destdir = args[1]
 
     if options.delete:
         return delete_all(worlddir, destdir)
-
     # First generate the world's chunk images
     w = world.WorldRenderer(worlddir)
     w.go(options.procs)
@@ -67,5 +78,22 @@ def delete_all(worlddir, tiledir):
                 print "Deleting {0}".format(filepath)
                 os.unlink(filepath)
 
+def list_worlds():
+    "Prints out a brief summary of saves found in the default directory"
+    print 
+    worlds = world.get_worlds()
+    if not worlds:
+        print 'No world saves found in the usual place'
+        return
+    print "Detected saves:"
+    for num, info in sorted(worlds.iteritems()):
+        timestamp = time.strftime("%Y-%m-%d %H:%M",
+                                  time.localtime(info['LastPlayed'] / 1000))
+        playtime = info['Time'] / 20
+        playstamp = '%d:%02d' % (playtime / 3600, playtime / 60 % 60)
+        size = "%.2fMB" % (info['SizeOnDisk'] / 1024. / 1024.)
+        print "World %s: %s Playtime: %s Modified: %s" % (num, size, playstamp, timestamp)
+
+
 if __name__ == "__main__":
     main()

world.py

@@ -6,9 +6,11 @@ import multiprocessing
 from PIL import Image
 
 import chunk
+import nbt
 
 """
 This module has routines related to generating all the chunks for a world
+and for extracting information about available worlds
 
 """
 
@@ -119,3 +121,35 @@ class WorldRenderer(object):
 
         return results
 
+def get_save_dir():
+    """Returns the path to the local saves directory
+      * On Windows, at %APPDATA%/.minecraft/saves/
+      * On Darwin, at $HOME/Library/Application Support/minecraft/saves/
+      * at $HOME/.minecraft/saves/
+
+    """
+    
+    savepaths = []
+    if "APPDATA" in os.environ:
+        savepaths += [os.path.join(os.environ['APPDATA'], ".minecraft", "saves")]
+    if "HOME" in os.environ:
+        savepaths += [os.path.join(os.environ['HOME'], "Library",
+                "Application Support", "minecraft", "saves")]
+        savepaths += [os.path.join(os.environ['HOME'], ".minecraft", "saves")]
+
+    for path in savepaths:
+        if os.path.exists(path):
+            return path
+
+def get_worlds():
+    "Returns {world # : level.dat information}"
+    ret = {}
+    save_dir = get_save_dir()
+    for dir in os.listdir(save_dir):
+        if dir.startswith("World"):
+            world_n = int(dir[-1])
+            info = nbt.load(os.path.join(save_dir, dir, "level.dat"))[1]
+            info['Data']['path'] = os.path.join(save_dir, dir)
+            ret[world_n] = info['Data']
+
+    return ret